JSSM, a JavaScript state machine - the FSM for FSL
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    Variable action_label_charsConst

    action_label_chars: ReadonlyArray<{ from: string; to: string }> = ...

    Inclusive character ranges accepted by ActionLabelUnescaped — i.e., the characters legal inside a single-quoted action label without escaping. Space (U+0020) is included; the apostrophe ' (U+0027) is explicitly excluded since it terminates the label.

    Three ranges: U+0020U+0026, U+0028U+005B, U+005DU+FFFF.

    import { action_label_chars } from 'jssm';
    action_label_chars.some(r => ' ' >= r.from && ' ' <= r.to); // => true
    action_label_chars.some(r => "'" >= r.from && "'" <= r.to); // => false